Water flow regulator



FIG. 1 is a side elevational view of a water flow regulator showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a perspective view thereof.

The broken lines shown in FIG. 3 represent a portion of the water flow regulator that forms no part of the claimed design. 

CLAIM The ornamental design for a water flow regulator, as shown and described. 